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Kluyveromyces contains a functional ABF1-homologue.
P M Gonçalves1, K Maurer, W H Mager
1Department of Biochemistry and Molecular Biology, Vrije Universiteit, Amsterdam, The Netherlands.
Nucleic Acids Research
|May 11, 1992
Summary
The ABF1 protein homologue from Kluyveromyces lactis (KIABF1) was identified and cloned. KIABF1 shares functional conservation with Saccharomyces cerevisiae ABF1, highlighting conserved protein functions across species.
Area of Science:
- Molecular Biology
- Yeast Genetics
Background:
- ABF1 is a key protein in Saccharomyces cerevisiae, regulating transcription and DNA replication.
- Evidence suggests a similar protein exists in Kluyveromyces lactis.
Purpose of the Study:
- To identify conserved functional domains of ABF1 by cloning and sequencing its homologue from K. lactis.
- To investigate functional conservation between yeast species.
Main Methods:
- Gene cloning and sequencing of the ABF1 homologue from K. lactis (KIABF1).
- Comparison of KIABF1 and S. cerevisiae ABF1 (ScABF1) sequences.
- Functional complementation assay of KIABF1 in S. cerevisiae.
Main Results:
- The K. lactis ABF1 homologue (KIABF1) gene was successfully cloned and sequenced.
- KIABF1 is smaller than ScABF1 and shows high homology in the N-terminal region.
- A conserved 20-amino acid stretch exists in the divergent C-terminal domains.
- KIABF1 functionally substituted ABF1 in S. cerevisiae.
Conclusions:
- KIABF1 possesses conserved functional domains with ScABF1, particularly in the N-terminus and a specific C-terminal region.
- The multiple functions of ABF1 are conserved between K. lactis and S. cerevisiae.
- This study identifies key conserved regions essential for ABF1 protein function.